Makefile

.PHONY: all
all: btfhub

#
# make
#

.ONESHELL:
SHELL = /bin/sh

PARALLEL = $(shell $(CMD_GREP) -c ^processor /proc/cpuinfo)
MAKE = make
MAKEFLAGS += --no-print-directory

#
# tools
#

CMD_TR ?= tr
CMD_CUT ?= cut
CMD_AWK ?= awk
CMD_SED ?= sed
CMD_GIT ?= git
CMD_RM ?= rm
CMD_MKDIR ?= mkdir
CMD_TOUCH ?= touch
CMD_GO ?= go
CMD_GREP ?= grep
CMD_CAT ?= cat
CMD_MD5 ?= md5sum
CMD_RSYNC ?= rsync
CMD_CLANG ?= clang
CMD_STATICCHECK ?= staticcheck

.check_%:
#
	@command -v $* >/dev/null
	if [ $$? -ne 0 ]; then
		echo "missing required tool $*"
		exit 1
	else
		touch $@ # avoid target rebuilds due to inexistent file
	fi

#
# tools version
#

GO_VERSION = $(shell $(CMD_GO) version 2>/dev/null | $(CMD_AWK) '{print $$3}' | $(CMD_SED) 's:go::g' | $(CMD_CUT) -d. -f1,2)
GO_VERSION_MAJ = $(shell echo $(GO_VERSION) | $(CMD_CUT) -d'.' -f1)
GO_VERSION_MIN = $(shell echo $(GO_VERSION) | $(CMD_CUT) -d'.' -f2)

.checkver_$(CMD_GO): \
	| .check_$(CMD_GO)
#
	@if [ ${GO_VERSION_MAJ} -eq 1 ]; then
		if [ ${GO_VERSION_MIN} -lt 18 ]; then
			echo -n "you MUST use golang 1.18 or newer, "
			echo "your current golang version is ${GO_VERSION}"
			exit 1
		fi
	fi
	touch $@

#
# version
#

LAST_GIT_TAG ?= $(shell $(CMD_GIT) describe --tags --match 'v*' 2>/dev/null)
VERSION ?= $(if $(RELEASE_TAG),$(RELEASE_TAG),$(LAST_GIT_TAG))

#
# environment
#

DEBUG ?= 0
UNAME_M := $(shell uname -m)
UNAME_R := $(shell uname -r)

ifeq ($(DEBUG),1)
	GO_DEBUG_FLAG =
else
	GO_DEBUG_FLAG = -w
endif

ifeq ($(UNAME_M),x86_64)
   ARCH = x86_64
   LINUX_ARCH = x86
   GO_ARCH = amd64
endif

ifeq ($(UNAME_M),aarch64)
   ARCH = arm64
   LINUX_ARCH = arm64
   GO_ARCH = arm64
endif

#
# variables
#

PROGRAM ?= btfhub

#
# btfhub tool
#

STATIC ?= 0
GO_TAGS =

ifeq ($(STATIC), 1)
    GO_TAGS := $(GO_TAGS),netgo
endif

GO_ENV =
GO_ENV += GOOS=linux
GO_ENV += CC=$(CMD_CLANG)
GO_ENV += GOARCH=$(GO_ARCH)

SRC_DIRS = ./cmd/ ./pkg/
SRC = $(shell find $(SRC_DIRS) -type f -name '*.go' ! -name '*_test.go')

$(PROGRAM): \
	$(SRC) \
	| .check_$(CMD_GO) \
	.checkver_$(CMD_GO)
#
	$(GO_ENV) $(CMD_GO) build \
		-tags $(GO_TAGS) \
		-ldflags="$(GO_DEBUG_FLAG) \
			-X main.version=\"$(VERSION)\" \
			" \
		-v -o $@ \
		./cmd/btfhub/

#
# btfhub tests
#

.PHONY: test-unit
test-unit: \
	$(SRC) \
	| .check_$(CMD_GO) \
	.checkver_$(CMD_GO)
#
	$(GO_ENV) \
	$(CMD_GO) test \
		-short \
		-race \
		-v \
		./cmd/... \
		./pkg/...

#
# code checkers
#

.PHONY: check-vet
check-vet: \
	| .check_$(CMD_GO) \
	.checkver_$(CMD_GO) \
#
	$(GO_ENV) \
	$(CMD_GO) vet \
		-tags $(GO_TAGS) \
		./cmd/... \
		./pkg/...

.PHONY: check-staticcheck
check-staticcheck: \
	| .check_$(CMD_GO) \
	.checkver_$(CMD_GO) \
#
	$(GO_ENV) \
	$(CMD_STATICCHECK) -f stylish \
		-tags $(GO_TAGS) \
		./cmd/... \
		./pkg/...

#
# repository
#

BTFHUB_ARCHIVE_DIR ?= ../btfhub-archive
LOCAL_ARCHIVE_DIR ?= ./archive

.PHONY: bring
bring: \
	| .check_$(CMD_RSYNC)
#
	@echo ""
	@if [ ! -d $(BTFHUB_ARCHIVE_DIR) ]; then
		echo "ERROR: make sure to have the btfhub-archive repository at $(BTFHUB_ARCHIVE_DIR)"
		echo ""
		exit 1
	fi
	echo -n "WARNING: this will delete all the files in $(LOCAL_ARCHIVE_DIR), press enter to continue"
	echo -n " ... "
	read nop
	echo ""
	$(CMD_RSYNC) -av --delete --exclude=.git* $(BTFHUB_ARCHIVE_DIR)/ $(LOCAL_ARCHIVE_DIR)/
	echo ""

.PHONY: take
take: \
	| .check_$(CMD_RSYNC)
#
	@echo ""
	if [ ! -d $(BTFHUB_ARCHIVE_DIR) ]; then
		echo "ERROR: make sure to have the btfhub-archive repository at $(BTFHUB_ARCHIVE_DIR)"
		echo ""
		exit 1
	fi
	echo -n "WARNING: this will take files from $(LOCAL_ARCHIVE_DIR) into $(BTFHUB_ARCHIVE_DIR), press enter to continue"
	echo -n " ... "
	echo ""
	read nop
	$(CMD_RSYNC) -av \
		--exclude=.git* \
		--exclude=*.deb \
		--exclude=*.ddeb \
		--exclude=*.rpm \
		$(LOCAL_ARCHIVE_DIR)/ $(BTFHUB_ARCHIVE_DIR)/
	echo ""
	echo "INFO: now goto $(BTFHUB_ARCHIVE_DIR) and commit the changes"
	echo ""

#
# clean
#

.PHONY: clean
clean:
#
	$(CMD_RM) -rf $(PROGRAM)
	$(CMD_RM) -f .check*